<style>
  .showContainer {
    height: 30px;
  }

  .biaoqian {
    position: fixed;
    bottom: 0;
    background-color: #F8F8F8;
  }
</style>
<footer class="container showContainer">
  <!-- <p class="biaoqian">小航 1606769349@qq.com</p> -->
</footer>
<div class="biaoqian">小航 1606769349@qq.com</div>